yellow leafs?

[JayTrinity]

Its been REALLY HOT 110F.

I just dont know enough to tell.

Also its only on the INSIDE of the plants where it does not get much sun. There never any on the outside.

We are about to preflower.

I hit hard today with organic super bat guano Nitrogen to green them up.

Both photos are the same plant. One showing its viger and size (About 6 foot) and the other the inner inside and bottom.

We cleaned up the bottoms and there many crunchy yellow leafs.

 

[BigPharma]

I have those as well bit only on one particular strain. It's has sativa in it, so a big plant (also six footish). I really doubt a nitro problem in my case as none others have it. I sprayed with organicide plant doctor as a precaution, the high heat opens the plant up to pathogens d
Spread by pests, some strains are more susceptible

 

[CoastalKind]

Your plant is consuming the leaves that it deems the least valuable and using the resources to feed the new growth. Feeding it was the right call as plants this time of year are starting develop there flowers. I would hit them with a full range on macro and micro nutrients right now to allow good bud sets. The plant is not bad looking though. You are a still on right on track.